{"product_id":"grade-10-9-british-standard-hex-countersunk-flat-head-screws-10pcs","title":"10pcs Grade 10.9 Hex Countersunk Flat Head Screws British Standard","description":"\n\u003ch2\u003eJARBLUE Grade 10.9 British Standard Hex Socket Countersunk Flat Head Screws – 10-Pack\u003c\/h2\u003e\n\u003cp\u003eUpgrade your metalworking and DIY projects with these \u003cstrong\u003eGrade 10.9 Carbon Steel Hex Socket Countersunk Flat Head Screws\u003c\/strong\u003e from JARBLUE. Engineered to British Standard specifications, these high-strength machine screws deliver exceptional holding power, a flush-fitting profile, and reliable performance across a wide range of applications — from mechanical assemblies to structural fabrication.\u003c\/p\u003e\n\u003cp\u003eWhether you're working on automotive builds, precision engineering, or heavy-duty joinery, these flat head bolts sit perfectly flush with the material surface for a clean, professional finish. Available in six British Standard thread sizes to suit your exact requirements.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable Thread Sizes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT1:\u003c\/strong\u003e 1\/4 – 20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT2:\u003c\/strong\u003e 1\/8 – 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT3:\u003c\/strong\u003e 3\/16 – 24\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT4:\u003c\/strong\u003e 3\/8 – 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT5:\u003c\/strong\u003e 5\/16 – 18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eT6:\u003c\/strong\u003e 5\/32 – 32\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e JARBLUE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Grade 10.9 Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e British Standard (BSW \/ BSF)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Style:\u003c\/strong\u003e Hex Socket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Flat (Countersunk)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScrew Type:\u003c\/strong\u003e Machine Screws\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 10 Pieces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose These Screws?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHigh Strength Grade 10.9\u003c\/strong\u003e – Superior tensile strength for demanding applications\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFlush Finish\u003c\/strong\u003e – Countersunk flat head sits level with the surface, ideal for tight clearances\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eBritish Standard Thread\u003c\/strong\u003e – Compatible with standard BSW\/BSF tapped holes\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e – Excellent durability and resistance to shear forces\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHex Socket Drive\u003c\/strong\u003e – Allows high torque application with an Allen\/hex key\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCE Certified\u003c\/strong\u003e – Meets recognized quality and safety standards\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eVersatile Sizing\u003c\/strong\u003e – Six thread size options to cover multiple project needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMechanical and structural assemblies\u003c\/li\u003e\n  \u003cli\u003eAutomotive and machinery fabrication\u003c\/li\u003e\n  \u003cli\u003eMetalworking and engineering projects\u003c\/li\u003e\n  \u003cli\u003eFurniture and joinery with flush-fit requirements\u003c\/li\u003e\n  \u003cli\u003eGeneral DIY and repair work\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/stainless-steel-self-tapping-screws-m2-2-m4-8-phillips-wood-hinge\"\u003e10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-durable-gold-blade-nut-metal-universal-trimmer-accessories-anti-loosening-line-left-hand-thread-replacement-parts-1\"\u003e10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories Anti-Loosening Thread\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/12pcs-16mm-momentary-push-button-switch-1no-metal-2-pin-self-reset\"\u003e12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does \"Grade 10.9\" mean for these hex countersunk screws?\u003c\/h4\u003e\n\u003cp\u003eA: Grade 10.9 refers to the mechanical strength classification of the carbon steel used. It indicates a minimum tensile strength of approximately 1040 MPa (1040 N\/mm²), making these screws suitable for high-stress mechanical and structural fastening applications where a standard-grade screw would not provide sufficient holding power.\u003c\/p\u003e\n\u003ch4\u003eQ: What British Standard thread specifications do these flat head screws follow?\u003c\/h4\u003e\n\u003cp\u003eA: These screws are manufactured to British Standard thread specifications (BSW\/BSF). The six available size variants cover thread pitches from 1\/8-40 up to 3\/8-16, making them compatible with standard British Standard tapped holes and nuts used in a wide range of engineering and mechanical contexts.\u003c\/p\u003e\n\u003ch4\u003eQ: What size hex key (Allen key) do I need to drive these screws?\u003c\/h4\u003e\n\u003cp\u003eA: The exact hex key size will vary depending on the thread size selected (T1–T6). As a general guide, larger diameter screws (e.g. 3\/8\") require larger hex keys. Please refer to a standard British Standard hex socket chart to match the correct Allen key size to your chosen screw variant before installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these screws suitable for outdoor or high-moisture environments?\u003c\/h4\u003e\n\u003cp\u003eA: These screws are made from carbon steel, which offers excellent strength but is not inherently corrosion-resistant. For outdoor or high-humidity environments, we recommend using them with a suitable protective coating or sealant to extend service life.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does \\\"Grade 10.9\\\" mean for these hex countersunk screws?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Grade 10.9 refers to the mechanical strength classification of the carbon steel used. 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